Use a clean lint-free cloth to wipe any dirt or fingerprints from the case, keypad, and display. If needed, wet the cloth with a bit of water to clean the display. Avoid getting cell phones wet. If moisture gets under the casing, remove the battery cover and take out the battery, SIM card and memory card. Insert all the pieces into a mason jar or any container with an airtight seal that is filled to the brim with rice. Close the lid and leave it undisturbed for at least 24 hours. Afterward, reassemble the phone, turn it on, and try it out. You may have full or at least partial functionally. If the phone does not work, it will need to be professionally serviced.